The Collaborative International Dictionary of English v.0.48:

Shittle \Shit"tle\, n. [See Shuttle.]
   A shuttle. [Obs.] --Chapman.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Shittle \Shit"tle\, a.
   Wavering; unsettled; inconstant. [Obs.] --Holland.
   [1913 Webster]